import cv2 as cv
img =cv.imread('../../data/messi5.jpg')
if img is None:
  print("[ERROR] fail to read Image!!!")
  exit(0)
b,g,r= cv.split(img)
cv.imshow("pic",b)
cv.waitKey(0)
cv.imshow("pic",g)
cv.waitKey(0)
cv.imshow("pic",r)
cv.waitKey(0)
mergeImg=cv.merge((b,g,r))
cv.imshow("picmergelmg",mergeImg)
cv.waitKey(0)
cv.destroyAllWdows()